introduCtion Plant Prequalification Program Created in 1965 by the Ontario Water Resource Commission (OWRC) and the Ontario Concrete pipe producers, the PPP was put in place to guarantee that materials of the highest quality was leaving their plants’ doors. Today, the Plant Prequalification Advisory Committee is chaired by representatives from the Municipal Engineers Association (MEA), Ministry of Transportation of Ontario (MTO), Ontario Provincial Standards (OPS), the Ontario Concrete Pipe Association (OCPA) and the Concrete Precasters Association (CPA). While these organizations comprise of groups located strictly in Eastern Canada, this program has nonetheless become the benchmark of quality for the vast majority of our nation’s concrete pipe producers. In fact, many of Western Canada’s largest municipalities have directly specified that concrete pipe producers must be PPP compliant in order to supply their products within these market areas. Owners of infrastructure projects that purchase precast concrete drainage products from prequalified producers are delivered materials that have been tested for quality throughout the manufacturing process and inspected upon completion. Concrete drainage products supplied from a prequalified plant comply with the requirements of the latest editions of CSA standards for concrete pipe, including CAN/CSA A257.1, A257.2, A257.3, A257.4, ASTM C507M, and OPSS 1351. Reinforced concrete box sections, meanwhile, must comply with the latest edition of the Ontario Provincial Standards Specification (OPSS) 1821 and the Canadian Highway Bridge Design Code, CAN/CSA S6, both of which include considerations for three-sided structures. As a requirement of the PPP, a thirdparty engineer must be retained to carry out an independent inspection of the program member’s plant and product offerings. Sample products are tested according to program specifications in line with industry standards, and the third-party engineer is responsible for preparing a detailed report outlining compliance or noncompliance with the prequalification requirements, together with any recommendations they may have. Once any shortcomings have been addressed and resolved, the program Chair will issue the Prequalification Certificate. Annual intermediate inspections are conducted during the first two years following certification, and the products made over this time are to be sampled and tested as required. The Certificate states the product to which the prequalification applies and is normally valid for 12 months after the date of issue. Each year, prequalified plants are inspected by a third-party engineer that performs checks and tests to ascertain whether quality control and the standard of workmanship are being maintained at a satisfactory level. At every third year interval, the third-party engineer undertakes a more detailed inspection and testing program comparable to that of the original prequalification process. ConCrete pipe stormwater treatment teChnologies box seCtions manhole and CatCh basin material LAFARGE PIPE eMANUAL PAGE 23